<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>input样式2</title>
    <link rel="stylesheet" href="../../css/bootstrap.css">
    <style>

        body {
            margin: 30px;
        }



    </style>
</head>
<body>
<div class="input-group">
    <span class="input-group-addon" id="basic-addon1">用户名</span>
    <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
    <span class="input-group-addon" id="basic-addon1">用户名</span>
    <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
    <span class="input-group-addon" id="basic-addon1">用户名</span>
    <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
    <span class="input-group-addon" id="basic-addon1">用户名</span>
    <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
</div>
</body>
</html>